May10 was the first day of my cycle i had sex on the 20th with my boyfriend and also the 26th with my ex when did i conceive? my cycle is 28 days long

Ex most likely.: It is possible that either date could be the date of conception. However, ovulation usually occurs around day 14 of a 28 day cycle. This would put you at around the 24th for ovulation. Thus, the 26th is a little more likely for conception that the 20th.

Uh OH, ?Either?: Well, assuming your ovulation was on or around the 24th, then it is possible either one of theses encounters may be responsible for getting you pregnant.